Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b76906213047de…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 19:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7eb8e14c7de6928cfede592f04e67f96 SHA-1: fcc7e91d7fc892bc4bfedd0f03c156d1a5e94af6 SHA-256: b9b76906213047de12a82be9ea1f10fd271c87d21b417ced75e2f93bcf877eb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous URLs, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of a URL with a 'utm_term' parameter related to a game download further supports the phishing or malware distribution pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=king+of+fighter+2002+plus+free+download
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d122a365f3---pufizun.pdf
    • http://odontoflash.eu/userfiles/files/39552230730.pdf
    • http://forglory.cz/ckfinder/userfiles/files/wogesi.pdf
    • https://biothiennam.com/media/ftp/file/gekipibe.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614341c0930a7---sapuvasekajuxefikosemib.pdf
    • https://dallaslandscapedesign.com/media/files/87086781772.pdf
    • http://www.allatpatikapecs.hu/images/file/sirupubaxet.pdf
    • http://simp-q.ru/userfiles/file/tutalidofifidib.pdf
    • http://omegapizza.net/uploads/files/wasotozefinuxenovujuzag.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/79792753137.pdf
    • https://www.nevjegykiraly.hu/userfiles/files/42523793910.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_50FCF4EB36DCFFD0.pdf
    • http://dcbestwings.com/uploads/files/11164392035.pdf
    • http://mamaskitchenorder.com/uploads/files/xojolomeva.pdf
    • https://sthouseluxury.com/upload/files/42469323852.pdf
    • http://119pump.net/d/files/39468920988.pdf
    • https://e-uchebnici.com/img/file/43324292220.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/24635037387.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec9ca3a2a1---57535584094.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aca2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA2 16792 bytes
font_01_sfnt_off0000c4b9.bin
3b52030972b6658d7a777ca11a9b9f4041fe324da962c9ad2077d47438fa6997		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B9 11196 bytes
font_02_sfnt_off0000deb9.bin
89aad5ebadc1007614b1a07f314dabf3bb1589db08a9ee2c891747ce67f2ce8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 14920 bytes

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